Device for testing pressure-gages.



No. 747,530, PATENTED DEC. 22, 1903. G. B. BOSWORTH.

' DEVICE POB. TESTING PRESSURE GAGrES.-

APPLIOATION HL'ED JULY 11, 1902. No MODEL.

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UNITED STATES Patented December 22, 1903.

yPATENT Ornlcn.

CHARLES B. BOSWORTH, OF SOMERVIIJLE, MASSACHUSETTS, ASSIGNOR TO STAR BRASS MANUFACTURING COMPANY OF BOSTON, MASSACHU- SETTS, A CORPORATION OF MASSACHUSETTS.

DEVICE FOR TESTING PRESSURE-GASES.

.SPECIFICATION forming part of Letters Patent No. 747,530, dated December 22, 1903.

Application led July 11, 1902. Serial No. 115,150. (No model.)

It consists in providing the device, first,

with a duid-holding reservoir connected with a chamber common to the fluid-forcing apparatus, the fluid pressure balancing or weighing means, and the gage, and, second, in means connecting the passage from the chamber to the gage with the said reservoir in such a manner as to provide for the return of the uid from the gagev to the reservoir instead of to the chamber, as is now common, and also in a manner to connect thel chamber with the reservoirand at the same time shut out the gage and maintain such Huid-pressure therein as an operation of -the device may have caused and in order that the pressure therein may be increased or added to by a subsequent operation of the device.

I will now describe the invention in conjunction with the drawings which' form a part of this specification, and wherein- Figure 1 is a view of a testing device provided With my improvements and showing the same in vertical section and in elevation. Fig. 2 is a view taken through the passage from the chamber to the gage upon a line with the valve therein and also showing the valve.

In the drawings, A represents the stand o-r frame of the testing'device. Preferably it is made of cast-iron. It has in its base a fluidholding reservoir a. for holding the f'luid used in testing the gage, and above it it has a chamber af, from which extends upward a vertical cylinder 0.2, and which cylinder contains a rod or piston b, supporting upon its upper end a weight-holder B. The chamber a' is also connected by a passage a3 with the chamber o of the pressure-cylinder C, containing the usual pressure-applying device. This comprises a piston'c and a screw c2, working in a nut c3 in the cylinder-head c4. The screw extends outside the head and isprovided with a handle o5, byI means of which it is turned. The chamberc is of a diameter to contain when the piston has been drawn out a sufficient supply of fluid for working the apparatus, as will hereinafter be described. The chamber of.' is also connected by a passage d in a pipe D, which forms a bracket for supporting the pressure-gage to be tested, but which is not shown with said gage when it is mounted upon the end of the bracket, ex

cepting as hereinafter stated. It will thus be seen that the chamber a is common to the reservoir, the Apressure-applying device, the weighing piston or means, and the gage.

The fluid-holding reservoir a has between it and the chamber o. a check-valve, which opens to permit the fluid to be drawn by the outward movement of the pressurepiston into the chamber and which closes automatically after said uid has been so drawn and is held closed during the reverse movement of the pressure-piston in forcing the uid from the chamber ainto the gage and against the Weighing-piston.

The chamber ct preferably is connected with the bottom of the reservoir in order that all the iiuid contained therein may be utilized. The check-valve is constructed and the connection between the chamber and the bottom of the reservoir is obtained in the following manner: The passage between the reservoir and the chamber is threaded to receive and hold a sleeve a4, which is screwed into it and the upper end o f which is in the chamber o. and has a valve-seat a5. In it is mounted a slide check-valve 0.6, terminating in the valve-seat a7, which closes upon the sleeve valve-seat a5. The extent of movement of the check-valve is limited in any desired Way. The sleeve a4 has attached to it a downwardextending pipe or tube as, the lower open end of which is contained in a depression a in the bottom of the reservoir. The passage am in this tube and in the sleeve connects the reservoir with the chamber a. The outward movement; of the pressure-piston c' in its chamberc causes the check-valve to be lifted a-nd the testing uid to ow from its reservoir through the passage am into the chambers a c and the passages therefrom. The check-valve automatically closes at the end, of this fluid-drawing action of the piston, and a reverse movement of the piston will of course act to hold the check-valve closed, and thus shut off the connection between the reservoir and the chamber ct during the testing of a gage.

The passage d in the bracket-pipe D is connected by a passage e in the pipe e with the reservoir a. A valve E is arranged in the bracket-pipe at its intersection with the pipe e'. This valve is, in effect, a three-way valve in that it serves to open the passage d from the chamber a to the gage when it closes the passage e from the passage d to the reservoir or to open a passage from the gage to the reservoir by means of the part of the passage d beyond the valve and the passage e when it serves to close that portion of the passage d between it and the chamber and in that it serves to connect the chamber a/ with the reservoir at by means of the portion of the passage d between the valve and the chamber and the passage e and when the valve acts to close the portion of the passage d between it and the gage. The trst of these actions is the one which the valve occupies when the piston is being operated to force the testing fluid into the gage and against the weighingpiston. The second position of the valve insures the discharge or escape of the testing fluid from the gage directly to the duid-holding reservoir a. The third position of the valve provides for accu mulative action of' the tester in that it permits the use of two or more charges for testing the same gage and for holding the charges in the gage while a new charge is being drawn by the pressurepiston from the reservoir.

The reservoir is shown as provided with a filling-hole a. in its bottom, which is closed by a screw plug or cap cl2, and the upper end of this cap is represented as provided with a cavity a9, within which the lower end of the tube 0.10 may extend.

The testing device, excepting as above indicated, is used in the ordinary way of such devices. The employment of a reservoir for holding the testing fluid and its connection with the main chamber and the gage-passage and the employment of a three-way valve all serve to contribute means whereby the efficiency of the deviceis increased and an economy in its use secured.

I have represented the three-way valve as having a triangular washer, upon the edge faces of which are directions for indicating the various connections which the valve makes when said faces are uppermost, (see Fig. 2,) where F represents the triangular Washer, with the words To test gage on its upper or exposed face and which indicates that the valve is then in a position to open the connection between the chamber a and the gage.

The operation of the device is as follows: The gage the spring of which is to be tested is mounted upon the gage-holder at the end of the bracket-pipe D. The valve E is turned to close the passages d and e to the gage. The piston c' is then near its innermost position in the cylinder, thereby reducing the capacity of the chamber c to very nearly its smallest extent. The pressure fluid, preferably oil, is contained in lhereservoir a and is under atmospheric pressure only. The piston is then moved outward in the chamber c slowly by turning the screw c2 by hand. This causes the fluid to be drawn from the reservoir a and to enter the chamber a. and the chamber c in the cylinder. The capacity of the reservoir and of this chamber is only sufficient for a single charge of' the apparatus. The chamber c, having thus been enlarged and filled to the desired extent, the valve E is then turned to open the passage d to the gage-tube and to close the passage e from the passage d to the reservoir. The movement of the piston c is then reversed by the turning of' the screw c2, which slowly moves the piston in the cylinder against the fluid and with any stress desired, forcing it from the cylinder c through the chamber a into the passages a2 d and into the Bourdon tube. The degree of pressure desired having been reached, the pressure may be maintained in these chambers and passages andthe tube as long as may be desired without further movementof the piston. The pressure in the distributing chamber a. varies with that of the pressure in the chamber c and cannot be augmented excepting by the inward forcing movement of the piston c, which affects the pressure in all the chambers and passages of the apparatus which are open to it. The repetition of the movement of the piston would eect no increase in the pressure or add Huid to the chambers unless the piston were drawn outward in the chamber c farther than it was drawn upon its first outward movement. The gage-spring thus having been tested, the valve E is then turned to permit the fiuid to run back of its own weight from the gagetube and the part of the passage d beyond the valve into the reservoir-,whereit is again held at atmospheric pressure until it is again drawn into the chamber a and cylinder c by the outward movement of the pistou c' in preparation for the testing of another gage. The check-Valve aopens automatically to permit the piston to draw the fluid from the reservoir into the chambers a.' c and continues open so long as there is draft exerted by the piston. When, however,the movementof' the piston is reversed to exert pressure upon the IOO IIO

iiuid which it has drawn, the valve automatically closes the connection with the reservoir.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States- 1. In a portable device for testing gages or similar instruments,a casing containing a distributing-chamber, an exhaust receiving and supply chamber, pressure weighing means connected with said distributing-chamber, a gage-holder, a passage connecting said gageholder with said distributing-chamber, a second passage connecting a point in said firstnamed passageintegrmediate the gage-holder and distributing-chamber with said exhaust receiving and supply chamber, a valve located at the junction of said passages whereby said distributing-chamber may be connected at will with said gage-holder or said exhaust receiving and ysupply chamber, and a third passage connecting said exhaust receiving and supply chamber with said distributingchamber, said passage being normally closed,

and means whereby said distributing-cham` ber may be filled through said third passage from said exhaust receiving and supply chamber.

2. In a portable device for testing gages or similar instruments, the combination of an exhaust receiving and supply chamber in the body of the device, a distributing-chamber in communication therewith, a check-valve between the two chambers opening away from the exhaust receiving and supply chamber, a gage-h older communicating with the distributing-chamber, pressure-weighing means, communicating passages from t-he weighing means to the distributing-chamber, and pressure-applying means in operative relation to the distributing-chamber and its various connections for operating the check-valve to supply the distributing-chamber, and then applying the pressure to the weighing means and gage-holder.

3. In a portable device for testing gages or similar instruments, the combination of an exhaust receiving and supply chamber in the body of the device, a distributing-chamber in connection therewith, a check-valvebetween the two chambers opening away from the exhaust receiving and supply chamber, a gageholder, a passage from the gage-holder to the distributing-chamber, a second passage from a point intermediate the holder and distributing-chamber in the aforesaid passage to they exhaust receiving and supply chamber, a valve at the junction of the two passages whereby the holder and distributing-chamber may be exhausted to the exhaust receiving andvsupply chamber, pressure-weighing means, communicating passages from the weighing means to the distributing-chamber, and pressure-applying means in operative relation to the distributing-chamber and its various connections for operating the checkand then applying the pressure to the weighing means and gage-holder.

4:. In a device for testing gages or similar instruments, the combination of an exhaust receiving and supply reservoir for holding a charge of tluid at constant normal pressure, a distributing-chamber with which said reset'- voir connects, a gage-holder having a passage extending from said chamber to the gage, a pressureweighing means having a passage connecting with said chamber, a single acting, nonaccumulative, fluid charging and forcing device also connected with said chamber, having a iiuid -holding capacity which with that of the chamber is sufficient to receive and hold a single operative charge for testing the gage, a [luid draft and forcing piston forming part of the iuid charging and forcing device, a single movement ot' which in one direction is sufficient to draw into the distributing chamber and its chamber from the reservoir a charge of fluid and a single movement of which in the reverse direction applies direct pressure to the fluid, the gage, and the pressure -weighing means, an automatic valve between the reservoir and the distributing-chamber, an exhaustpassage extending from the passage of the gage-holder to said reservoir, and a three way valve at the intersection of said passages, common to both and constructed to close the exhaustpassage to the reservoir and open the gageholder passage, or to close the' gage -holder passage and connect the gage with the'reservoir, or to shut off the gage and connect the distributing-chamber with the reservoir.

5. In a gage-tester having agage-holder, a pressure-weighing means, a duid-forcing device and a chamber common to them all, a reservoir, a sleeve between the reservoir and the chamber having at its upper end a valveseat and also having a tube extending to near the bottom of the reservoir, and a valve mounted in said sleeve to be movable vertically therein'having a valve-seat t-o close upon the valve-seat of the sleeve.

6. In a gage-testing device, in combination with a chamber, a duid-forcing device, a fluidweighing means, a gage-holder and a passage extending from the chamber to the gageholder, a reservoir connected with the chamber and with the passage, a three-way valve at the intersection of the passage and the reservoir connection having a triangular washer, the edge faces of which bear indications as to the location of; the valve.

7. In a portable device for testing gages or similar instruments, a casing containingin its base an exhaust receiving and supply chamber, a distributing-chamber located Vabove said exhaust receiving and supply chamber, a pressure weighing means also connected with said distributing chamber and located above it, a passage normally closed connecting said exhaust receiving and supply chamvalve to supply the distributing-chamber, t berwithsaiddistributing-chamber,meansfor IIO filling said distributing chamber from said exhaust receiving and supply chamber, a gage-holder, a passage connecting said gageholder with said distributing-chamber, a second passage connecting said first-named passage with said exhaust receiving and supply chamber, and a valve located at the junction of said passages whereby said distributingchamber may be connected with either said gage-holder or said exhaust receiving and ro supply chamber.

CHARLES B. BOSWORTH.

Witnesses:

F. F. RAYMOND, 2d, SAUL SIPPUSTEIN. 

